Sewing machine



Sept. 3, 1946. 1, GA RclA 2,407,148

Filed 'se pa, 1942 3 Sheets-Sheet 1 ka 4., Y

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Sept. 3, 1946. l. M. A. GARCIA 2,407,148

' SEWING MACHINE Filed Sept. 8, 1942 3 Sheets-Sheet 2 Q so EN EN @NN A zmN mww w VmN QQN u NNM N QNN m w v QNH @NH Sept. 3, 1946.

l. M. A. GARCIA SEWING MACHINE Fi'led Sept. 8, 1942 3 Sheets-Sheet 3ATTDRNKYI Patented Sept. 3, 1946 SEWING MACHINE Ivan M. A. Garcia,Bremerton, Wash.

Application September 8, 1942, Serial No. 457,668

My invention relates to sewing machines, and has among its objects andadvantages the provision of an improved machine designed to stitchfabrics by looping together threads of the fabrics acted upon.

In the accompanying drawings:

Figure 1 is a sectional view taken along the line I I of Figure 2;

Figure 2 is a sectional view taken along the line 2--2 of Figure 1;

Figure 3 is a sectional View taken along the line 3-3 of Figure 2;

Figure 4 is a sectional view taken line 44 of Figure 2;

Figure 5 is a sectional view taken line 55 of Figure 2;

Figure 6 is a face view of the bed plate;

Figure 7 is a face view of cam actuator wheels;

Figure 8 is a side view of the structure of Figure 7 t Figure 9 is aperspective view of a cam;

Figure 10 is a view of the fabric working end portion of the needle; 7

Figure 11 is a. diagrammatic view illustrating the needle section;

Figure 12 is a diagrammatic view illustrating the needle action withrespect to the formation of interlocking sewing loops from the fabricbeing sewed;

Figure 13 is a diagrammatic view showing the action of the needle duringthe operation of comalong the along the pleting engaged loops; and

Figure 14 is a detail view of the interengaged loops formed by theneedle.

In the embodiment selected for illustration, I make use of a base IIIupon which the sewing machine I2 is mounted. The machine includes ahorizontal bed plate I4 provided with a needle opening I6. A presser I8is attached to the lower end of a vertical bar square in cross sectionand guided for vertical movement in openings 22 in the walls 24 and 26of a housing 28 spaced vertically from the bed plate I4. The presser I8is yieldingly pressed against the bed plate I4 by reason of acompression spring 30 having one end engaging the wall 26 and its otherend engaging a collar 32 secured to the bar 20. The fabric being sewedis arranged between the presser I8 and the bed plate I4 in the usualmanner. A finger bar 34 is attached to the bar 2|! and extends through aslot 36 in the wall 38 of the housing 28 to facilitate lifting of thepresser, as when the work is being placed in position on the bed plateI4.

Means for feeding the work comprises two 5 Claims. (01. 112-198) wheels40 having notched peripheral faces 42, portions of which peripheriesextend through slots 44 in the bed plate I4 for engagement with thework. Both wheels 40 are fixed to a shaft 46 rotatably journaled in thewalls 48 and 50 of the base housing 52. To the shaft 46 and exteriorlyof the housing 52 is keyed a wheel 54 having a notched peripheral face56 engaged by a feeder link 58 having its upper end pivotally connectedat 60 with a lever 62 having one end pivotally connected at 64 to abracket 66 attached to a wall 68 of the arm III which constitutes asupport for the housing 28.

The opposite end of the lever 62 is provided .with two spaced fingers I4having bearing formations I6 lying in engagement with the opposite'facesI8 of a cam fixed to a vertical bar 82 to the lower end of which theneedle 84 is detachably connected. This bar may be rotated through themedium of a handwheel 86 or other source of power (not shown).

In Figure 9, the cam 80 includes a flange 88 having two verticallyspaced portions 90 and 92 located at diametrically opposite points withrespect to the axis of the cam. The portions 90 and 92 areinterconnected by diagonal portions 84.

To the Wall 96 of the housing 28 is mounted a disk 98, as by a boltIEIB. Two rollers I02 are rotatably mounted on the disk 98 and arespaced to receive the flange 88 therebetween, as illustrated inFigure 1. Since the rollers I02 are fixed against vertical movement,rotation of the bar 82 will impart reciprocatory motion thereto inaddition to its rotary motion.

In Figure 11, the bar 82 has an upward motion indicated by the arrowI04, a rotary motion through one-half revolution indicated by the arrowI06, a downward motion indicated by the arrow I08 and a rotary motionthrough one-half revolution indicated by the arrow I I 0. Since theneedle 84 moves with the bar 82, 2. corresponding motion is imparted tothe needle. In other words, the needle penetrates the work in itsdownward stroke, rotates one-half revolution, withdraws from the workand then makes another half revolution.

The lower part of the needle 84 is of U-shaped formation, as shown atFigure 10, having an upturned hook II2 providing a thread engagingcrotch while the lower extremity tapers to a point indicated at I I4.

A spring arm I26 fastened to the side wall of the machine frame isdirected so that its end portion is resiliently pressed against theteeth 56 of wheel 54 to preclude reverse rotation of this wheel when thelink 58 traverses its return in operative stroke. An inclined arm I28having its upper end fastened against the wall 50 extends adjacent toone side edge of the lower part of the link 58 and the upper free endportion of the spring arm I28, as shown to advantage at Figures 2, 3 and5 so that this inclined arm on one side and the wall 58 on the oppositeside restrain sidewise movement of the link and spring arm to maintainthe same in contact with the notches of the wheel 54.

During operation, as for example to stitch a pair of superposed sheetsof fabric IIB fed horizontally from right to left along the bed 14 andunder the presser 18, as viewed from Figure 1, the needle is initiallycaused to move downwardly from its uppermost position above the sheets,as shown at A in Figure 12, to penetrate both sheets. When the hook H2attains its lowermost position below the sheets it is turned through ahalfturn movement, as seen at B, following Which it is pulled straightupward. During its return movement through the sheets it successivelyengages a pair of superposed threads thereof, indicated at H8, andelevates the same to looped arrangement as at C. After reaching itselevated position the needle is again turned through a half-turn andtwists the lops I20 as shown at D. Upon subsequent descent of the needlefrom the last position the link 58 effects a one-step partial turn ofwheel 54 and, through the shaft 46, similar movement of the feed wheels50 in a counterclockwise direction, referring to Figure 1, to advancethe sheets a predetermined step toward the left. Since the needleremains within the loops thus formed the latter are elongated and pulledto down turned arrangement by the tension thereon, the needle againpenetrating the sheets in an advanced point. At the bottom of its strokethe needle is again turned so that during its subsequent upward strokeit again engages and loops a pair of threads which are drawn through thenow stationary first loops as illustrated at F of Figure 12 and G ofFigure 13. When the needle has again attained its top position itexecutes another half-turn and the sheets are advanced to the secondstep to bend the second loops I24 downwardly and enchain the first loop.as seen at H. The operation is repeated, as at I, for the desired lengthof the sheets to form a succession of chain stitches as shown at Figure14, securely connecting the sheets of fabric.

I claim:

1. A sewing machine for uniting woven superposed fabrics, comprising aneedle bar mounted for both rotary and reciprocatory movement, means forcontinuously rotating the needle bar, a needle carried by the needle barhaving a hook shaped to pass freely through the fabrics and to pullthreads from the fabrics upon withdrawal of the needle to form a loopfrom the thread, a cam means acting on the needle bar to reciprocate thesame during rotation, whereby the said needle is caused to pass throughthe fabric and after a half-turn of the needle to pick up the threadsand then to withdraw the needle from the fabric and after the nexthalf-turn to withdraw said loop and impart a twist thereto.

2. The invention described in claim 1 wherein a bed plate is providedfor supporting the fabric and provided with an opening through whichsaid needle passes, a rotary feed for the fabric, and an operatingconnection between said cam means and said rotary feed to impart feedingmotion thereto.

3. The invention described in claim 1 wherein said needle is detachablyconnected with the rotary and reciprocatory needle bar, and in whichsaid cam means comprises a cam fixed to said -needle bar, a relativelyfixed cam actuator for imparting reciprocatory motion to the needle barthrough relative rotation of the cam with respect to the actuator, saidcam having a continuous ffange provided with portions offset one fromthe other axially of the shaft and interconnected by diagonal portions,said actuator comprising two rotary wheels engaging opposite sides ofsaid flange, and a mount for said wheels.

4. The invention described in claim 1 wherein a'bed plate is providedfor supporting the fabric and having an opening for passage of theneedle therethrough, said reciprocatory and rotary needle bar havingsaid needle detachably connected therewith, said cam means comprising acam fixed to said needle bar and a relatively fixed cam actuatorimparting reciprocatory motion to the needle bar through relativerotation of the cam with respect to the actuator, a rotary feed memberfor the fabric, a notched wheel fixedly connected with said rotary feedmember, a pivoted lever operatively connected with said cam to bepivoted through reciprocatory motion of the bar and'the cam, and anoperating connection between said lever and said notched wheel to impartstep by step rotary motion to said feed member.

5. The invention described in claim 1 wherein a bed plate is providedfor supporting the fabric and having an opening for passage of theneedle therethrough, said reciprocatory and rotary needle bar havingsaid needle detachably connected therewith, said cam means comprising acam fixed to said needle bar and a relatively fixed cam actuatorimparting reciprocatory motion to the needle bar through relativerotation of the cam with respect to the actuator, a rotary feed memberfor the fabric, a notched wheel fixedly connected with said rotary feedmember, a pivoted lever operatively connected with said cam to bepivoted through reciprocatory motion of the needle bar and the cam, anoperating connection between said lever and said notched wheel to impartstep by step rotary motion to said feed member, a presser coacting withsaid bed plate, said presser being attached to a bar, non-circular incross section and mounted in corresponding openings in a supporttherefor for guiding the presser bar in a reciprocatory path, a fingerlift on said presser bar and spring means acting on said presser bar toyieldingly press the presser against the fabric on the bed plate.

IVAN M. A. GARCIA.

